<template>
  <el-container class="home-container">
    <!--头部区-->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="" width="60px" height="60px">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主题区-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区-->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :unique-opened="true"
                 :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区-->
            <template slot="title">
              <!--图标-->
              <i :class=" iconsObject[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>

            <!--二级菜单-->
            <el-menu-item :index="'/'+subItem.path " v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <!--图标-->
              <i class="el-icon-menu"></i>
              <!--文本-->
              <span>{{ subItem.authName }}</span>
            </el-menu-item>
          </el-submenu>

        </el-menu>
      </el-aside>
      <!--右侧主题区-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
export default {
  name: 'Home',
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObject: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''

    }
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status != 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮切换菜单折叠
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }

  .el-main {
    background-color: #EAEDF1;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
